console.time("test");
//用于检测中间代码执行所需要的时间
//参数需要一样

const user = { name: "xiaowang", age: 23, qq: "3284770038@qq.com" };
console.log(user.name);
console.log(user.age);
console.log(JSON.stringify(user.qq));
console.timeEnd("test");